How “If __name__ == ‘__main__' ’” Works?

Solving the mystery of If __name__ == '__main__'.

Let's assume you have a python script first.py

# first.py

print('Hola from first.py')

if __name__ == '__main__':
    print('Hola first module __name__:' __name__')

# output
# Hola from first.py
# Hola first module __name__: __main__

If we run first.py using the command Python

python first.py, the __name__ variable for first.py will automatically become __main__.

# second.py

print('Hola from second.py')

if __name__ == '__main__':
    print('Hola second module __name__:' __name__')

# output
# Hola from …

command python python script script